Evaluation of Ag&amp;ndash;NiO mixture as a cathode contact material for solid oxide fuel cell applications

Shong, Wei-Ja; Liu, Chien‐Kuo; Yang, Peng; Lee, Ruey‐Yi; Lin, Kin-Fu

doi:10.2109/jcersj2.16261

Cited by 8 publications

(3 citation statements)

References 34 publications

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“…Conventionally used contact materials include Au and other expensive precious metals [10,23]. Although Ag and Ag-containing Ni alloys are more economical than other noble metals, the rapid thermal etching required and their high volatility at high temperatures limit their applications as contact materials [24][25][26]. Hence, researchers have been investigating perovskite-type oxides as possible contact materials.…”

Section: Introductionmentioning

confidence: 99%

LaNi0.6Co0.4−xFexO3−δ as Air-Side Contact Material for La0.3Ca0.7Fe0.7Cr0.3O3−δ Reversible Solid Oxide Fuel Cell Electrodes

et al. 2022

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The goal of the current work was to identify an air-side-optimized contact material for La0.3Ca0.7Fe0.7Cr0.3O3−δ (LCFCr) electrodes and a Crofer22APU interconnect for use in reversible solid oxide fuel cells (RSOFCs). LaNi0.6Co0.4−xFexO3 (x = 0–0.3) perovskite-type oxides were investigated in this work. The partial substitution of Co by Fe decreased the thermal expansion coefficient values (TEC) closer to the values of the LCFCr and Crofer 22 APU interconnects. The oxides were synthesized using the glycine–nitrate method and were characterized using X-ray thermodiffraction and 4-probe DC electrical conductivity measurements. Based on the materials characterization results from the Fe-doped oxides investigated here, the LaNi0.6Co0.2Fe0.2O3−δ composition was selected as a good candidate for the contact material, as it exhibited an acceptable electrical conductivity value of 395 S·cm−1 at 800 °C in air and a TEC value of 14.98 × 10−6 K−1 (RT-900 °C).

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Section: Introductionmentioning

confidence: 99%

LaNi0.6Co0.4−xFexO3−δ as Air-Side Contact Material for La0.3Ca0.7Fe0.7Cr0.3O3−δ Reversible Solid Oxide Fuel Cell Electrodes

et al. 2022

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“…Wilkinson and Zhu reported that area-specific resistance (ASR) was highly dependent on the type of perovskite used, such as lanthanum strontium cobalt ferrite (LSCF) versus lanthanum strontium manganite (LSM) in a Ag matrix (5). An ASR study of Ag-NiO composite showed about two orders of magnitude difference for samples made by die pressing versus paste form (6). In addition to silver based materials, other ceramic materials have been studied such as LaNi0.6Co0.4O3- ( 7), (La,Sr)(Fe,Co)O3 (8), Mn0.9Y0.1Co2O4 nano-sized coated La0.6Sr0.4Co0.2Fe0.8O3 powders (9), superconducting materials of YBa2Cu3O7-x (10), LaNi0.6Fe0.4O3 and La0.8Sr0.2FeO3 (11), Mn-Co and Ni-Co metal powders (12), LaNi0.6Co0.4O3- dip-coated Fe-Ce mesh (13), glass-La0.85Sr0.15MnO3 and glass-Sm0.5Sr0.5O3 composites (14), spinel-forming Cu-Mn metallic foam (15), and La0.6Sr0.4Co0.2Fe0.8O3-Cu2O composite (16).…”

Section: Introductionmentioning

confidence: 99%

Lanthanum Strontium Cobaltite-Alumina Fiber Composite Contact Material for Solid Oxide Fuel Cells

et al. 2021

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Short alumina fibers were added to LSCo contact material to enhance the contact strength and improve thermal cycle stability. Alumina fiber from 2.5 v% to 20 v% were mixed with LSCo and sintered at elevated temperatures. Sintering study showed retardation in densification of LSCo matrix with increasing alumina content. Sintered bulk strength exhibited similar behavior where strength greatly reduced at high alumina v%. Coefficient of thermal expansion showed consistent results with prediction from rule of mixture. Contact strength using anode supported YSZ bilayer coupons improved greatly with the presence of small amount (2.5-5 v%) alumina fibers and no substantial reduction after 10 deep thermal cycles. Candidate LSCo-Al2O3 contact materials was validated in a generic stack test fixture for 1000h at 800oC followed by 10 thermal cycles. Results of impedance analysis showed substantial improvement in thermal cycle stability as compared to LSCo parent materials.

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“…The Ag‐glass composite showed the desirable wetting and spreading with no degradation in conductance when tested for 750 hours at 750°C. A study on a similar composite of Ag–NiO showed about two orders of magnitude difference in ASR for samples made by die pressing vs paste form 6 . Other materials have also been investigated as candidate contact materials, such as LaNi 0 .…”

Section: Introductionmentioning

confidence: 99%

Thermal, mechanical, and electrical properties of LSCo/mullite composite contact materials for solid oxide fuel cells

Chou

Canfield

Bonnett

et al. 2020

Int J Applied Ceramic Tech

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Lanthanum strontium cobaltite (LSCo) is considered as a good candidate cathode contact material for solid oxide fuel cells, due to high electrical conductivity. However, LSCo has a very large coefficient of thermal expansion (CTE) than the cells and metallic interconnects. As a result, poor mechanical stability is expected during thermal cycling. To minimize the CTE mismatch, we investigate a composite approach involving mixing LSCo with an inert material of low CTE, such as mullite at volume fractions from 0.1 to 0.4. Composite's CTE shows a decreasing trend with increasing mullite volume fractions and is consistent with model predictions. X‐ray powder diffraction analysis of sintered LSCo/mullite composites exhibits no presence of other phases for samples aged for 500 hours at 800°C, indicating chemical compatibility. Electrical conductivity by a 4‐pt method shows a decreasing trend with increasing mullite content. Contact strength of as‐sintered and thermally cycled samples show that only the composite with 0.4 volume fraction has a measurable strength; the other composites have no strength. Overall, the composite approach is demonstrated in the LSCo/mullite system to lower the CTE and hence achieve thermal cycle stability. The addition of the inert phase to the LSCo matrix, however, also reduces the electrical conductivity.

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Evaluation of Ag–NiO mixture as a cathode contact material for solid oxide fuel cell applications

Cited by 8 publications

References 34 publications

LaNi0.6Co0.4−xFexO3−δ as Air-Side Contact Material for La0.3Ca0.7Fe0.7Cr0.3O3−δ Reversible Solid Oxide Fuel Cell Electrodes

LaNi0.6Co0.4−xFexO3−δ as Air-Side Contact Material for La0.3Ca0.7Fe0.7Cr0.3O3−δ Reversible Solid Oxide Fuel Cell Electrodes

Lanthanum Strontium Cobaltite-Alumina Fiber Composite Contact Material for Solid Oxide Fuel Cells

Thermal, mechanical, and electrical properties of LSCo/mullite composite contact materials for solid oxide fuel cells

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